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remove tidb_opt_fix_control from 6.5.7 release notes #16032

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Jan 8, 2024
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remove tidb_opt_fix_control from 6.5.7 release notes #16032

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1 change: 0 additions & 1 deletion releases/release-6.5.7.md
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Expand Up @@ -13,7 +13,6 @@ TiDB 版本：6.5.7

## 兼容性变更

+ 新增系统变量 [`tidb_opt_fix_control`](https://docs.pingcap.com/zh/tidb/v6.5/system-variables#tidb_opt_fix_control-从-v657-版本开始引入)，用于更细粒度地控制优化器的行为，并且避免集群升级后优化器行为变化导致的性能回退 [#43169](https://github.com/pingcap/tidb/issues/43169) @[qw4990](https://github.com/qw4990)
+ 新增 TiDB 配置项 [`performance.force-init-stats`](https://docs.pingcap.com/zh/tidb/v6.5/tidb-configuration-file#force-init-stats-从-v657-版本开始引入)，用于控制 TiDB 启动时是否在统计信息初始化完成后再对外提供服务 [#43385](https://github.com/pingcap/tidb/issues/43385) @[xuyifangreeneyes](https://github.com/xuyifangreeneyes)
+ 为减少日志打印的开销，TiFlash 配置项 `logger.level` 默认值由 `"debug"` 改为 `"info"` [#8568](https://github.com/pingcap/tiflash/issues/8568) @[xzhangxian1008](https://github.com/xzhangxian1008)

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